Cybersecurity and Ethical Hacking Tutorials

Complete OpenSSL and PKI tutorial - generate keys, build a Certificate Authority, issue SAN and ECC certificates, configure mTLS, renew and revoke certificates. 24 hands-on lessons tested on Linux.

Free, hands-on Wireshark tutorial covering capture, filters, decryption, TCP/UDP analysis, TLS/IPsec inspection, and real-world troubleshooting. 35+ packet-level examples with sample .pcap files included.

Learn how to install .deb files in Kali Linux using dpkg, apt, and gdebi (see [dpkg command](/dpkg-command-in-linux/)). Step- by-step commands, dependency fixes, and best practices.

How to export the variable "http_proxy" or "https_proxy" when there are special characters in username or password in Linux?

In this tutorial we will be setting up the Lab Environment which we will use through out the course of CompTIA PenTest+ Tutorial.

With mutual TLS authentication (MTLS), not only does the service side prove its identity by exposing a certificate, but also the clients prove their identity to the servers by exposing a client-side certificate.

Elliptic Curve Cryptography (ECC) is an encryption technique that provides public-key encryption similar to RSA. We can generate ECC certificates using openssl and install it on Apache server for verification

Cervantes is an open source, a collaborative platform designed for pen-testers and red teams looking to save time and manage their projects, clients,

Steps to create root and intermediate CA certificate and combine them to openssl create certificate chain. Openssl verify certificate chain (CA bundle)

Step by step instruction to generate Certificate Signing Request (CSR) for Subject Alternative Name (SAN) certificates using openssl with examples in Linux

Since you are here so I can only assume you are also interested in becoming cybersecurity penetration tester, also called an Ethical Hacker. This tutorial is

People say they know what SQL injection is, but all they have heard about or experienced are trivial examples. SQL injection is one of the most devastating

Step by step instructions to revoke or delete certificate from keystone and generate CRL Certificate Revocation List) using openssl in Linux with example openssl generate crl.

Create SAN certificate using openssl generate csr with san command line. Openssl sign CSR with Subject Alternative Name. openssl add san to existing certificate

Steps to create client certificate and server certificate using your own Certificate Authority chain (CA bundle) and configure Apache with SSL (HTTPS)

Learn how to generate a ca certificate and how to sign a certificate using openssl. Steps to create certificate authority CA and CSR with openssl

Steps to generate csr (certificate signing request) using openssl in Linux with examples. Create private key with and without passphrase.

Technically you can't renew expired root CA certificate instead you can create a new root ca certificate using private key with openssl. The new root CA certificate can be used to verify old certificates.

Step by Step instructions to renew SSL or TLS certificate (server/client) using OpenSSL command. Retain all SAN fields with X.509 extensions during renewal of certificate.

Step by Step instructions to renew self-signed certificate using OpenSSL command. Export CSR using expired certificate and using existing private key we can renew any kind of certificate

Step by Step instructions to use shell script to generate certificates with openssl. generate both self signed and rootCA signed certificates using bash or shell script without any prompt.

We must consider some important point when creating CSR or else we may face issues later while using the certificate

Step by Step instructions to manually expire any certificate using openssl. Different commands and methods to generate an expired certificate

Detailed comparison between openssl ca vs openssl x509 command with examples. Similarities and difference between ca vs x509 argument of openssl command

Step by Step instructions to add X.509 extensions to certificates, CSR, RootCA using openssl command.

Step by step instructions to generate duplicate certificates with OpenSSL CA using the same CSR with same Subject (Common Name) in all the certificates

Step by step guide to revoke missing or lost certificate using openssl. We can manually update the CA database to mark any certificate revoked and generate CRL

Install an SSL certificate on Nginx in just 4 steps. Secure your website with HTTPS and gain the trust of your visitors with a valid SSL certificate.

MAC Spoofing is the process of changing the Media Access Control (MAC) address of a network interface on a device that’s connected to a network. The MAC

ARP (Address Resolution Protocol) is a key network protocol used in IPv4 networks to link IP addresses to their corresponding MAC addresses. It plays an